Maybe one of the very very few devices where the moniker "Pro" in the name actually mean something?
"Pro" is a marketing designation that really annoys me. Manufactures use it as an otherwise meaningless designator of goodness. Pro means
professional, as in it is something that is used by someone making a living with the device. The chances this DAC will end up being used by a professional in a professional environment are vanishingly small. Maybe it might, and a tiny few instances will have the external clock used as it is intended. There are plenty of real life DACs made for professional use that have an external clock input. But professionals will stick to the brands they know, and will usually be looking for rack mount and system integration.
I remember when Tag-Heur used to market a whole range of "professional" watches. I guess maybe somewhere in the world some poor soul was locked in a room intently reading their watch and reading out "at the first stroke it will be ten fifty one and ten seconds..." Other than that is is pretty hard to make a case for professional use. (They were of course trying to make out that professional divers would use their watches, just as back in the day a whole range of watches were made for pilots. This is fantasy, and has been for many decades. Then you get high end watches with helium release values. Who are they kidding?)
Topping is of course one of the worst offenders with the use of "Pro". It is almost impossible to work out what a product of theirs is by its model name. Again, the possibility that any of their, otherwise excellent, products is actually of value in a true professional environment is close to zero.
Computer gaming graphics cards are another pet hate.
Really guys, will you all just knock it off? Please? It is getting old.